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Definition of helmet


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hel·met  audio  (hlmt) KEY  

NOUN:
    1. A head covering of hard material, such as leather, metal, or plastic, worn by football players, firefighters, construction workers, motorcyclists, and others to protect the head.
    2. The headgear with a glass mask worn by deep-sea divers.
    3. A pith helmet; a topi.
    4. A head covering, such as a balaclava, that is shaped like a helmet.
  1. A piece of armor, usually made of metal, designed to protect the head.
  2. Botany The hood-shaped sepal or corolla of some flowers.
tr. & intr.v.
hel·met·ed , hel·met·ing , hel·mets
To provide with or put on a helmet.

ETYMOLOGY:
Middle English, from Old French, diminutive of helme, of Germanic origin; see kel- 1 in Indo-European roots

OTHER FORMS:
helmet·ed (Adjective)


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The American Heritage® Dictionary of the English Language, Fourth Edition.
Copyright © 2000 by Houghton Mifflin Company.
Published by the Houghton Mifflin Company. All rights reserved.
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